Mitochondria and chloroplasts display similarities with bacteria that led to the endosymbiont theory. This theory states that an early ancestor of eukaryotic cells engulfed an oxygen-using non-photosynthetic prokaryotic cell. Eventually, the engulfed cell formed a relationship with the host cell in which it was enclosed, becoming an endosymbiont, a cell living within another cell. Indeed, over the course of evolution, the host cell and its endosymbiont merged into a single organism, a eukaryotic cell with a mitochondrion. At least one of these cells may have then taken up a photosynthetic prokaryote, becoming the ancestor of eukaryotic cells that contain chloroplasts.
—from Campbell Biology AP Edition, a book by Campbell
Active since October 7, 2017.
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Rank | Username | WPM | Accuracy | Date |
---|---|---|---|---|
1280. | efergodox (efergodox) | 75.56 | 97% | 2019-11-26 |
1281. | Markus (mkh90) | 75.55 | 97% | 2020-10-21 |
1282. | Laura (laurasee) | 75.51 | 97% | 2020-11-29 |
1283. | Jagonu (jagonu) | 75.48 | 95% | 2018-03-30 |
1284. | Simon (spookles) | 75.48 | 97% | 2018-09-14 |
1285. | Jamber (jamber_onyx) | 75.47 | 98% | 2019-09-24 |
1286. | Joey (joeymichaud) | 75.47 | 97% | 2018-11-12 |
1287. | . (majorleaguetyper) | 75.44 | 98% | 2018-06-07 |
1288. | Smajo (smajo) | 75.44 | 96% | 2019-07-17 |
1289. | Timo (ubulin) | 75.43 | 94% | 2019-05-20 |
1290. | bo (biznessmun) | 75.42 | 96% | 2020-09-09 |
1291. | ogkatumus (ogkatumus) | 75.42 | 96% | 2020-12-20 |
1292. | Delgerskhn (thege) | 75.41 | 98% | 2020-06-18 |
1293. | ju yun (schylarker) | 75.33 | 98% | 2017-10-15 |
1294. | Orgalorrrrg (orgalorg) | 75.31 | 98% | 2019-10-14 |
1295. | China nÂș1 (patato123) | 75.30 | 96% | 2020-05-12 |
1296. | tstats[gravityhurts] (gravi... | 75.27 | 96% | 2020-11-06 |
1297. | Tim (tim28) | 75.27 | 97% | 2018-07-03 |
1298. | Oneness (dreamtime) | 75.27 | 96% | 2019-11-22 |
1299. | Alex (ixichaosimi) | 75.24 | 96% | 2020-08-05 |
1300. | Charles (itscharles92) | 75.24 | 97% | 2019-02-09 |
1301. | potat (potatostodie) | 75.22 | 96% | 2020-09-28 |
1302. | deckador (deckador) | 75.13 | 97% | 2018-01-08 |
1303. | Ethan (queuequeueqq) | 75.13 | 96% | 2019-08-29 |
1304. | Obsidian (terthan) | 75.12 | 95% | 2018-01-22 |
1305. | MamyPoko (mamypoko) | 75.10 | 97% | 2017-10-17 |
1306. | rilee_h443 (rilee_h443) | 75.10 | 95% | 2020-06-21 |
1307. | Marlon (marlondestroyer) | 75.10 | 95% | 2020-08-02 |
1308. | achatore (achatore) | 75.10 | 97% | 2018-01-31 |
1309. | Dum (getintherobotshinji) | 75.09 | 97% | 2019-11-14 |
Universe | Races | Average WPM | First Race |
---|---|---|---|
Default (English) | 2,850 | 89.33 | October 7, 2017 |
Instant Death Mode | 3 | 99.10 | January 10, 2019 |
New English Texts | 1 | 108.31 | May 26, 2022 |
All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |